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(x-1)(x+1) - (xla la 2 +1)

Răspuns :

(a-b)(a+b)=a^2-b^2

x^2-1-x^2-1=-2

[tex](x - 1)(x + 1) - ( {x}^{2 } + 1) = [/tex]

[tex] = x(x - 1) + (x - 1) - {x}^{2} - 1 = [/tex]

[tex] = {x}^{2} - x + x - 1 - {x}^{2} - 1 = [/tex]

[tex] = - 1 - 1 =[/tex]

[tex] = - 2[/tex]